Editing Prosthesis (section)

====Foot====
Providing contact to the ground, the foot provides shock absorption and stability during stance.<ref>{{cite journal|doi=10.1097/00008526-200510001-00007|title=Perspectives on How and Why Feet are Prescribed|journal=Journal of Prosthetics and Orthotics|volume=17|pages=S18–S22|year=2005|last1=Stark|first1=Gerald}}</ref> Additionally it influences gait biomechanics by its shape and stiffness. This is because the trajectory of the center of pressure (COP) and the angle of the ground reaction forces is determined by the shape and stiffness of the foot and needs to match the subject's build in order to produce a normal gait pattern.<ref>{{cite journal|doi=10.1016/0966-6362(93)90038-3|title=Trajectory of the body COG and COP during initiation and termination of gait|journal=Gait & Posture|volume=1|pages=9–22|year=1993|last1=Jian|first1=Yuancheng|last2=Winter|first2=DA|last3=Ishac|first3=MG|last4=Gilchrist|first4=L}}</ref> Andrysek (2010) found 16 different types of feet, with greatly varying results concerning durability and biomechanics. The main problem found in current feet is durability, endurance ranging from 16 to 32 months<ref name="ReferenceB">{{cite journal |last1=Andrysek |first1=Jan |title=Lower-limb prosthetic technologies in the developing world: A review of literature from 1994–2010 |journal=Prosthetics and Orthotics International |date=December 2010 |volume=34 |issue=4 |pages=378–398 |doi=10.3109/03093646.2010.520060 |pmid=21083505 |s2cid=27233705 }}</ref> These results are for adults and will probably be worse for children due to higher activity levels and scale effects. Evidence comparing different types of feet and ankle prosthetic devices is not strong enough to determine if one mechanism of ankle/foot is superior to another.<ref name=":2">{{cite journal |last1=Hofstad |first1=Cheriel J |last2=van der Linde |first2=Harmen |last3=van Limbeek |first3=Jacques |last4=Postema |first4=Klaas |title=Prescription of prosthetic ankle-foot mechanisms after lower limb amputation |journal=Cochrane Database of Systematic Reviews |issue=1 |pages=CD003978 |date=26 January 2004 |volume=2010 |doi=10.1002/14651858.CD003978.pub2 |pmid=14974050 |pmc=8762647 |url=https://pure.rug.nl/ws/files/67438636/Hofstad_et_al_2004_Cochrane_Database_of_Systematic_Reviews.pdf }}</ref> When deciding on a device, the cost of the device, a person's functional need, and the availability of a particular device should be considered.<ref name=":2" />